In the mid-1980s, Toshiba’s industrial designers were apparently tasked with designing a Walkman that would be smaller than everyone else’s—in just one dimension, that is. They then came up with the KT-AS10, a/k/a the Walky:
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The unusual design called for a removable radio tuner unit shaped like the bottom two-thirds of a cassette.
With the tuner pulled out, you could then insert a cassette, which protruded out of the top of the unit.
So yes, the Walky was technically smaller (shorter) than any of its competitors.
So where do you put the tuner when you’re listening to a cassette? Hey man, that’s your problem.
It’s such a weird trade-off, but it’s kind of fun to see Japanese designers experimenting like this. It’s literally outside-of-the-box thinking.
That said, the unit doesn’t look fun to use. Here’s a demo video shot by someone selling one on eBay, to prove it works:
Funny thing: This video is at least partially faked. Watch closely around 1:19, and you’ll spot a jump in the video—look at the top of the cassette—yet the music continues uninterrupted. I hope whomever bought it on eBay didn’t get screwed.